$6x^2-54x+30=0$
$\lim_{x\to4}\left(\frac{c^2-16}{c-4}\right)$
$\frac{2x}{3}+\frac{x-3}{4}\ge2$
$\frac{x^7}{x}-\frac{y^7}{y}$
$x^2+2x>3$
$xy'-3y=x^2$
$\frac{6x^4+10x^2+5x^2+x+1}{x+\frac{2}{3}}$
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